When I look at pics of the A4 there is a hose running from the block to the air intake backfire filter of the carb. My A4 has never had this hose since myself and the previous owner operated it for the last 15 years or so. Believe it's referred to as the Breather Hose. What's the purpose of this hose and any concern if operating without it? Thx!
John
John
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